APCSA Unit 2 String Methods

Choose the line that assigns "love" to str2.

• str2 = str.substring(2,6);

• str2 = str.substring(2,5);

• str2 = str.substring(2);

• str2 = str.substring(4);

Choose the line that assigns "boba." to str2.

• str2 = str.substring(7);

• str2 = str.substring(7,11);

• str2 = str.substring(8,12);

• str2 = str.substring(8);

Choose the line that assigns "I" to str2.

• str2 = str.substring(0,1);

• str2 = str.substring(1,2);

• str2 = str.substring(0);

• str2 = str.substring(1);

What is the output from running this code block?

• equals method

• == operator

• (Nothing)

• equals method

  == operator

What is the result of running this code block?

• "." is printed.

• An exception is thrown.

• "America." is printed.

• "a" is printed.

What is the result of running this code block?

• "." is printed.

• An exception is thrown.

• "America." is printed.

• "a" is printed.

What method-call below could be used to determine whether str contains the String "States"? Choose all that apply.

• str.contains("States")

• str.indexOf("States")

• str.equals("States")

• str.compareTo("States")

What line of code assigns the first position of the String "time!" to the variable index?

• index = str.indexOf("time!");

• index = str.indexOf(5);

• index = str.contains("time!");

• index = str.contains(5);

What could possibly be the output from running this code block?

• -1

• 0

• 1

• true

Which method calls could be reliably used to decide whether the two strings are equal?

• str.compareTo(str2)

• str.equals(str2)

• str == str2

• str.contains(str2)